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GEOREF RECORD

Comparative compressibility of clinopyroxenes from mantle nodules

Paola Comodi, Francesco Princivalle, Massimilliano Tirone and Pier Francesco Zanazzi
Comparative compressibility of clinopyroxenes from mantle nodules
European Journal of Mineralogy (February 1995) 7 (1): 141-149

Abstract

Using single-crystal XRD with a diamond-anvil cell, the comparative compressibilities of two clinopyroxenes have been determined, one from a spinel lherzolite nodule from Pico Cabugi, NE Brazil, and the other from a spinel harzburgite nodule from Nemby, Paraguay; the Brazilian sample has more R (super 3+) in the M1 site, more Mg in the M2 site (i.e. lower Ca) and more Al in T than the Paraguayan sample. Cell parameters were determined at various P from 1 bar to 46 kbar, with both crystals together in the diamond-anvil cell. The bulk modulus is similar for both samples at approximately 1160-1170 kbar; for both clinopyroxenes beta (sub b) >> beta (sub c) >>beta <MIV%-3>a (sub sinbeta <D%0>. Greater differences are seen in the epsilon ) (sub 1) /epsilon (sub 3) ratios between the semi-axes of the strain ellipsoid of the two pyroxenes: the higher content of R (super 3+) in the M1 site and the lower Ca in the M2 site of the Brazilian crystal produces a more eccentric (010) section of the strain ellipsoid than for the Paraguay sample.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 1
Title: Comparative compressibility of clinopyroxenes from mantle nodules
Affiliation: Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy
Pages: 141-149
Published: 199502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 1995-021746
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Universita di Trieste, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199508
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